1256340229 has 2 divisors, whose sum is σ = 1256340230. Its totient is φ = 1256340228.

The previous prime is 1256340223. The next prime is 1256340259. The reversal of 1256340229 is 9220436521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 766736100 + 489604129 = 27690^2 + 22127^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256340229 - 2¹³ = 1256332037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256340194 and 1256340203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256340223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628170114 + 628170115.

It is an arithmetic number, because the mean of its divisors is an integer number (628170115).

Almost surely, 2^1256340229 is an apocalyptic number.

It is an amenable number.

1256340229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256340229 is an equidigital number, since it uses as much as digits as its factorization.

1256340229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1256340229 is about 35444.8900266315. The cubic root of 1256340229 is about 1079.0355556131.

The spelling of 1256340229 in words is "one billion, two hundred fifty-six million, three hundred forty thousand, two hundred twenty-nine".